I'm having difficulty understanding what determines the difficulty of a challenge. Currently i'm facing an ghost. The first option is Psychic and the tarot symbols are wand wand pentacle. For this challenge the difficulty is 11. The other option, besides flee, is a Presuasion, Lore. The difficulty for this choice is 6.My character has 2 swords 1 cup 2 wands 4 pentacle. What determines the difficutly? What makes one option 11 while the other is 6?